Friction brake



May N. P. v. Buus FRICTION BRAKE Filed 061;. 20, 1930 Patented May 15, 1934 UNITED STATES PATE 1,959,949 NT orncs Application October 2c, 1930, Serial No. 489,990

Denmark Ill October 22, 1929 1 (cl. Isa-m This invention refers to tion brakes particularly for rail vehicles such as tramway or railway vehicles and has for its object to provide a simple and effective arrangement 6 whereby the braking eil'ect obtained by a. number of braking devices is compensated present invention a brake is tion bodies acting on a brake an axle wherein the friction bodies are carried one at each end of a lever arm, preferably right angled, the other end of said arms being connected a connecting rod mechanism by means of which the lever arms are lit rotated to force the Eviction bodies against the said brake disc. The drawing shows three methods of carrying out the invention.

Figs. 1 and 2 show a side view and plan respec 20 tively of one embodiment of the invention.

Figs- 3 and 4 are plan views of two other em bodiments of the invention.

In the arrangement shown in Figs. 1 and 2, l is a part of the floor carrier or buggy frame of the g5 vehicle, 2 is one of the running wheels, 3 is the axle thereof, and 4 the brake disc. The brake system consists of four angle arms 8 rotatable about bolts and connected by rods 16 plane parallel to the According to the provided having fri l0 disc mounted on with the vehicle frame.

' 'hvo curved pieces 9 and 9' are connected with outer ends of the angle arms 8 which serve for the actuation of the brake. These are hinged to the more or less vertical rods 10, 10' of a con- 40 nected rod system 10, 11, 10'. The upper end of rod 11 can be displaced by a. connecting rod 12 in such manner, that the members 10 and 10' of the system are capable of being brought together or drawn apart by the springs 14, one of the curved 5 pieces 9' being carried directly by the rotating arm 10' and the other 9 by two swinging arms 13.

When the curved pieces 9 and 9 are moved'by pulling on the rod 12, against the pull of the springs 14 (which tend to bring the brak bodies 7 normally out of engagement with the brake bodies 7) the friction plates ,17'will move in pairs against each other and finally rest on the side surfaces of the brake disc 4. On eachbrake body coming into position against the disc 4 this forms a fixed point of rotation for the other parts of the brake system and, the remaining brake bodies 7 are brought to bear on disc 4. Only when all the four brake bodies 7, 17 have been brought to bear on the 00 actual brake action commence at all four brake improvements in fricbrake disc 4 does the evenly, with mutual pressure equalizaand without a bending strm on the is here a matter of indmerence whether the friction plates 17 are quite new or much worn; the brake efiect is in all cases the same, it only takes place with worn plates slightly later in the operative stroke than unwom plates.

In practice, the arrangement is so constructed that the deflection outward of the arm or" the angle lever 8 carrying the brake I from its parallel position to the brake disc 4, iswith a new friction disc 17' exactly as large as the deflection inwards from this parallel position with a worm friction disc, since then: the variations from the maximum etfect of the brake rod 12; are at a In the form of construction of the brake shown in Fig. a, the menu I 6 and I are formed into a ring shaped part I hinged .on two opposite angle arms 8, the friction plates 17 also ring shaped being fiized to the brake disc 4': and rotating therewith, though the plates 17, can, if necessary, be fixed on the rings Z. The suspension. of these parts can be arranged in similar manner to that in Figs. 1 and 2.

Til.

Fig. 4 shows a construction of the brake in which the operation is etlected by means of an angle arm 8 rocking directly about a bolt 15 hinged on one of the brake bodies I, and a connecting rod 16' connected with the second brake body The arrangement'can also be carried out in a difierent manner without departing from the principle of the invention. Fol-instance, theangle arms could impart a. movement of two brake bodies from inside outwards on two brake discs tem 10, 11, 12 friction plate carriers '7 could be used instead of the .friction ring carriers '7'.

I claim:

In a brake mechanism the combination of a brake disc or the like, two brake shoes arranged one on each-side of the brake disc, an essentially 1'ight-angular- -"bell crank lever'attached" to each brake shoe, 9. connection bar (9) pivoted to and connecting the extreme end of the bell crank lever arms, elongated pivot holes in said connection bar, a floating connection rod (16) connecting the rotation pivots of the two right-angular bell crank levers, and a stay rod attached to the connection bar for actuation purposes.

NIELS PETER VALDEMAR. BUUS. 

